K522 :
-a^6*x^2*y + 3*a^4*b^2*x^2*y - 3*a^2*b^4*x^2*y + b^6*x^2*y +   3*a^4*c^2*x^2*y + 6*a^2*b^2*c^2*x^2*y - 9*b^4*c^2*x^2*y - 3*a^2*c^4*x^2*y +   7*b^2*c^4*x^2*y + c^6*x^2*y - a^6*x*y^2 +   3*a^4*b^2*x*y^2 - 3*a^2*b^4*x*y^2 + b^6*x*y^2 + 9*a^4*c^2*x*y^2 -   6*a^2*b^2*c^2*x*y^2 - 3*b^4*c^2*x*y^2 - 7*a^2*c^4*x*y^2 + 3*b^2*c^4*x*y^2 -   c^6*x*y^2 + a^6*x^2*z - 3*a^4*b^2*x^2*z +   3*a^2*b^4*x^2*z - b^6*x^2*z - 3*a^4*c^2*x^2*z - 6*a^2*b^2*c^2*x^2*z -   7*b^4*c^2*x^2*z + 3*a^2*c^4*x^2*z + 9*b^2*c^4*x^2*z - c^6*x^2*z +   a^6*y^2*z - 3*a^4*b^2*y^2*z + 3*a^2*b^4*y^2*z -   b^6*y^2*z + 7*a^4*c^2*y^2*z + 6*a^2*b^2*c^2*y^2*z + 3*b^4*c^2*y^2*z -   9*a^2*c^4*y^2*z - 3*b^2*c^4*y^2*z + c^6*y^2*z + a^6*x*z^2 -   9*a^4*b^2*x*z^2 + 7*a^2*b^4*x*z^2 + b^6*x*z^2 -   3*a^4*c^2*x*z^2 + 6*a^2*b^2*c^2*x*z^2 - 3*b^4*c^2*x*z^2 +   3*a^2*c^4*x*z^2 + 3*b^2*c^4*x*z^2 - c^6*x*z^2 - a^6*y*z^2 -   7*a^4*b^2*y*z^2 + 9*a^2*b^4*y*z^2 - b^6*y*z^2 + 3*a^4*c^2*y*z^2 -   6*a^2*b^2*c^2*y*z^2 + 3*b^4*c^2*y*z^2 - 3*a^2*c^4*y*z^2 -   3*b^2*c^4*y*z^2 + c^6*y*z^2 = 0